#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (C) 2013 Gauvain Pocentek <gauvain@pocentek.net>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import requests

class GitlabConnectionError(Exception):
    pass

class GitlabGetError(Exception):
    pass

class GitlabCreateError(Exception):
    pass

class GitlabUpdateError(Exception):
    pass

class Gitlab(object):
    def __init__(self, url, private_token):
        self.url = '%s/api/v3'%url
        self.private_token = private_token

    def list(self, objClass, **kwargs):
        url = objClass.url
        if kwargs:
            url = objClass.url % kwargs
        url = '%s%s?private_token=%s'%(self.url, url, self.private_token)
        if kwargs:
            url += "&%s"%("&".join(["%s=%s"%(k,v) for k,v in kwargs.items()]))

        try:
            r = requests.get(url)
        except:
            raise GitlabConnectionError('Can\'t connect to GitLab server (%s)'%self.url)

        if r.status_code == 200:
            cls = objClass
            if objClass.returnClass:
                cls = objClass.returnClass
            return [cls(item) for item in r.json]
        else:
            raise GitlabGetError('%d: %s'%(r.status_code, r.text))

    def get(self, objClass, id, **kwargs):
        url = objClass.url
        if kwargs:
            url = objClass.url % kwargs
        url = '%s%s/%d?private_token=%s'%(self.url, url, id, self.private_token)

        try:
            r = requests.get(url)
        except:
            raise GitlabConnectionError('Can\'t connect to GitLab server (%s)'%self.url)

        if r.status_code == 200:
            cls = objClass
            if objClass.returnClass:
                cls = objClass.returnClass

            return cls(r.json)
        else:
            raise GitlabGetError('%d: %s'%(r.status_code, r.text))

    def delete(self, objClass, id, **kwargs):
        # FIXME: not working for project members, gitlab bug or not?
        url = objClass.url
        if kwargs:
            url = objClass.url % kwargs
        url = '%s%s/%d?private_token=%s'%(self.url, url, id, self.private_token)

        try:
            r = requests.delete(url)
        except:
            raise GitlabConnectionError('Can\'t connect to GitLab server (%s)'%self.url)

        if r.status_code == 200:
            return True
        return False

    def create(self, objClass, objData, **kwargs):
        url = objClass.url
        if kwargs:
            url = objClass.url % kwargs
        url = '%s%s?private_token=%s'%(self.url, url, self.private_token)

        try:
            r = requests.post(url, objData)
        except:
            raise GitlabConnectionError('Can\'t connect to GitLab server (%s)'%self.url)

        if r.status_code == 201:
            cls = objClass
            if objClass.returnClass:
                cls = objClass.returnClass

            return cls(r.json)
        else:
            raise GitlabCreateError('%d: %s'%(r.status_code, r.text))

    def update(self, objClass, id, objData, **kwargs):
        url = objClass.url
        if kwargs:
            url = objClass.url % kwargs
        url = '%s%s/%d?private_token=%s'%(self.url, url, id, self.private_token)

        try:
            r = requests.put(url, objData)
        except:
            raise GitlabConnectionError('Can\'t connect to GitLab server (%s)'%self.url)

        if r.status_code == 200:
            cls = objClass
            if objClass.returnClass:
                cls = objClass.returnClass

            return cls(r.json)
        else:
            raise GitlabUpdateError('%d: %s'%(r.status_code, r.text))


class GitlabObject(object):
    url = None
    returnClass = None
    constructorTypes = None
    canGet = True
    canGetList = True
    canCreate = True
    canUpdate = True
    canDelete = True

    @classmethod
    def update(cls, gl, id, data, **kwargs):
        if not cls.canUpdate:
            raise NotImplementedError

        if not cls.url:
            raise NotImplementedError

        return gl.update(cls, id, data, **kwargs)

    @classmethod
    def create(cls, gl, data, **kwargs):
        if not cls.canCreate:
            raise NotImplementedError

        if not cls.url:
            raise NotImplementedError

        return gl.create(cls, data, **kwargs)

    @classmethod
    def list(cls, gl, **kwargs):
        if not cls.canGetList:
            raise NotImplementedError

        if not cls.url:
            raise NotImplementedError

        return gl.list(cls, **kwargs)

    @classmethod
    def get(cls, gl, id, **kwargs):
        if not cls.canGet:
            raise NotImplementedError

        if not cls.url:
            raise NotImplementedError

        return gl.get(cls, id, **kwargs)

    @classmethod
    def delete(cls, gl, id, **kwargs):
        if not cls.canDelete:
            raise NotImplementedError

        if not cls.url:
            raise NotImplementedError

        return gl.delete(cls, id, **kwargs)

    def __init__(self, data):
        for k, v in data.items():
            if self.constructorTypes and k in self.constructorTypes:
                self.__dict__[k] = self.constructorTypes[k](v)
            else:
                self.__dict__[k] = v

    def __str__(self):
        return '%s => %s'%(type(self), str(self.__dict__))


class User(GitlabObject):
    url = '/users'

class Project(GitlabObject):
    url = '/projects'
    constructorTypes = {'owner': User}
    canUpdate = False
    canDelete = False

class ProjectMember(GitlabObject):
    url = '/projects/%(project_id)d/members'
    returnClass = User

class ProjectHook(GitlabObject):
    url = '/projects/%(project_id)d/hooks'

class ProjectBranch(GitlabObject):
    url = '/projects/%(project_id)d/repository/branches'
    canDelete = False
    canUpdate = False
    canCreate = False

class ProjectTag(GitlabObject):
    url = '/projects/%(project_id)d/repository/tags'
    canGet = False
    canDelete = False
    canUpdate = False
    canCreate = False

class ProjectCommit(GitlabObject):
    url = '/projects/%(project_id)d/repository/commits'
    canGet = False
    canDelete = False
    canUpdate = False
    canCreate = False

class ProjectMilestone(GitlabObject):
    url = '/projects/%(project_id)s/milestones'
    canDelete = False

class ProjectMergeRequest(GitlabObject):
    url = '/projects/%(project_id)d/merge_request'
    canDelete = False

class Issue(GitlabObject):
    url = '/issues'
    canGet = False
    canDelete = False
    canUpdate = False
    canCreate = False

class ProjectIssue(GitlabObject):
    url = '/projects/%(project_id)s/issues/'
    returnClass = Issue
    canDelete = False

class Group(GitlabObject):
    url = '/groups'

class Session(object):
    def __init__(self):
        raise NotImplementedError

class Snippet(GitlabObject):
    url = '/projects/%(project_id)d/snippets'

class User(GitlabObject):
    url = '/users'

class CurrentUser(GitlabObject):
    url = '/user'
    canGetList = False
    canCreate = False
    canUpdate = False
    canDelete = False

class CurrentUserKey(GitlabObject):
    url = '/user/keys'
    canUpdate = False

if __name__ == '__main__':
    # quick "doc"
    #
    # See https://github.com/gitlabhq/gitlabhq/tree/master/doc/api for the
    # source

    # register a connection to a gitlab instance, using its URL and a user
    # private token
    gl = Gitlab('http://192.168.123.107:8080', 'JVNSESs8EwWRx5yDxM5q')

    # get a list of projects
    for p in Project.list(gl):
        print p.name
        # get associated issues
        issues = ProjectIssue.list(gl, project_id=p.id)
        for issue in issues:
            print "  %d => %s (closed: %d)"%(issue.id, issue.title, issue.closed)
            # and close them all
            ProjectIssue.update(gl, issue.id, {'closed': 1}, project_id=p.id)